Alexey Glutsyuk, “On curves with the Poritsky property”, J. Fixed Point Theory Appl., 24, no. 2, 2022, 35
Hellmuth Stachel, “On the motion of billiards in ellipses”, European Journal of Mathematics, 8, no. 4, 2022, 1602
Gil Bor, Mark Spivakovsky, Serge Tabachnikov, “Cusps of caustics by reflection in ellipses”, Journal of London Math Soc, 110, no. 6, 2024, e70033